pH

Question

pH

BlackTom AI · Accepted Answer

Question restatement: The prompt asks about pH and provides several statements to judge their truthfulness.

Option 1: 'increases with acidity.' This is misleading. In fact, pH decreases as acidity increases; higher acidity means more H+ and lower pH, so this statement is false.

Option 2: 'is measured on a scale of 0 to 10.' The standard pH scale ranges from 0 to about 14 in aqueous solutions, not limited to 0–10, so this claim is incorrect.

Option 3: 'is a measure of the hydrogen ion concentration.' This is correct. pH is defined as the negative logarithm of the hydrogen ion activity/concentration in a solution, so it directly reflects H+ levels.

Option 4: 'reflects sodium content of body fluids.' Sodium content is not what pH measures; pH relates to hydrogen ion concentration, not electrolyte quantity like sodium, so this is false.

Option 5: 'is not related to amounts of carbon dioxide in the body.' This is inaccurate. In biological systems, CO2 forms carbonic acid in solution and influences hydrogen ion concentration, thereby affecting pH; thus pH is related to CO2 levels, so this statement is false.

Summary of reasoning: Each option is evaluated against the fundamental definition of pH as a log-scale measure of hydrogen ion concentration, and its dependence on factors like acidity and carbon dioxide. The correct understanding is that pH indicates H+ concentration, not a simple 0–10 scale, not sodium content, and it is indeed related to CO2 through carbonic acid dynamics.

pH

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